typed op• 数据种类:signal → feature
• 调用:fullseye.apply(img, "tb_zero_crossing_rate", a=0.5, b=0.5)(2-D 的模型是一张图 + 两个标量旋钮 a,b∈[0,1])
*无图: 该算子以 signal 为输入。从图像开始的 Studio 程序无法到达该类型，请参见下方的可运行示例。*
相邻采样点中符号发生变化的比例——一种低成本的音高/噪声程度线索。
> 以下的详细说明为原文 —— 摘要与标题已翻译。
Exact zeros are neither a crossing nor a sign: a crossing is counted only when
the sign changes between consecutive *non-zero* samples, and the rate divides
by the number of adjacent sample pairs `len(x) - 1. So [1, 0, 1, 0, 1]` is
`0.0 and [1, 0, -1] is 0.5 (before 2026-09-02 diff(sign(x))` counted
every touch of zero as a crossing: `1.0` for both).
Typed bridge of the 1d op `zero_crossing_rate into the 2-D evolution registry: the same implementation, called under the op(v, a, b) convention. This op has no tunable parameter; a and b` are unused.
• 示例数据目录(下载 URL / 许可证) —— 2-D 用 skimage.data(BSD/公有领域)加合成图,3-D 给出真实数据源(Stanford/PDS 等)的下载 URL。
• 算子来历与参考文献 —— 该算子族所依据的研究/方法出处。
• (暂无)
feature 作为输入)typed)tb_points_to_voxel · tb_estimate_point_normals · tb_iss_keypoints · tb_angle_3points · tb_project_points · tb_render_point_depth · tb_statistical_outlier_removal · tb_radius_outlier_removal
*Provenance: ops.py — 2D 算子登记表。本条目由 tools/opdocs.py md 自动生成(请勿手工编辑)。*
© 2026 Kazufumi Furuse — Fullseye operator documentation. Licensed under Apache-2.0.